Back in July 2012 the first tentative mentions of Android running on the Pi were made.
Following the threads and links from Google I found these instructions at:
Step 1: Download an image (this was a compressed file) from http://rosefire.us/~razdroid/aaa801/Gingerbread+EthernetManager.7z
Step 2: Extract the image file.
Step 3: Create the image file to a SD card (minimum 2GB) using dd or image writer which can be found here https://launchpad.net/win32-image-writer/+download
Step 4: Boot!
Running a simple time-trial it took approximately 30 second to launch an Android welcome screen and then approximately another 5 minutes before the user interface appeared. This sadly was too slow to be useable (at the moment).